/Engine/Plugins/Runtime/Metasound/Source/MetasoundFrontend/Public/MetasoundArrayNodes.h
TArrayNumOperatorgets the number of elements in an Array. The operator uses theFNodeFacadeand defines the vertex, metadata and vertex interface statically on the operator class.
template<typename ArrayType> class TArrayNumOperator : public [Metasound::TExecutableOperator< TArrayNumOperator< ArrayType > >](API\Plugins\MetasoundGraphCore\TExecutableOperator)